IXL.com Online Tutoring K-12 for Math and English

Practice makes perfect, and IXL makes math and language arts practice fun! IXL motivates students through interactive games and exercises while keeping teachers and parents informed and involved. With more than 4,000 skills spanning pre-school through high school, IXL offers a dynamic and enjoyable environment suitable for any learning style.

Check them out: http://www.ixl.com/